One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,14,17)(11,18,20,15)(12,21,13,16)(19,23,22,24)(25,26,29,33)(27,30,34,38)(28,31,36,32)(35,39,40,37)(1,2)(3,7)(4,6)(5,8)(9,11,14,20)(10,15,17,18)(12,19,13,22)(16,23,21,24)(25,27)(26,30)(28,35)(29,34)(31,39)(32,37)(33,38)(36,40)(1,3,4,8)(2,5,6,7)(26,31)(27,34)(28,36)(30,37)(32,33)(38,39)(9,12,14,13)(10,16,17,21)(11,19,20,22)(15,23,18,24)(2,6)(5,7)(9,13,14,12)(10,16,17,21)(11,19,20,22)(15,24,18,23)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.